Two infusions ago after they doubled his Remicade dose, my son started getting bad, bad headaches that would wake him up at night off and on for two weeks -about 2 to 3 weeks after his infusion. Tylanol didn't touch the pain. The headaches started again 2 weeks after his last Remicade infusion. He started taking 3.5 Benedryl at bedtime and that seems to be really helping. (He weighs 150 lbs.) . He hasn't had a headache since he started the benedryl. Our doctor said some people have reactions to the remicade 2 to 3 weeks after infusion and they usually treat it with steroids and benadryl a few days before infusion and for few weeks after. For my son, it seems that just benadryl is working for him. I don't know if that would help anyone else. I might add that my son had bloodwork today to check for Remicade antibodies. No results yet.